/*
 * Copyright 2009-2012 Aluminum project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.googlecode.aluminumproject.writers;

import com.googlecode.aluminumproject.AluminumException;

/**
 * A writer that decorates another writer.
 */
public interface DecorativeWriter extends Writer {
	/**
	 * Returns the underlying writer.
	 *
	 * @return the decorated writer (never {@code null})
	 */
	Writer getWriter();

	/**
	 * {@link #flush() Flushes} this writer and replaces the underlying writer.
	 *
	 * @param writer the underlying writer to use
	 * @throws AluminumException when this writer is closed or when the underlying writer can't be replaced
	 */
	void setWriter(Writer writer) throws AluminumException;
}